98 12v p0748

[smokn03]

I keep getting this code.My trans is stuck in limp mode.No over drive or lockup.
does anybody have any ideas what to check or a good wiring diagram
So I can start tracing wires?Truck did it with the old trans.I had a new trans put in and it
still does the same thing.Checked and cleaned all the connections.Maybe a bad pcm?any helpis appreciated.

 

[AsTroSS]

From wha year the new transmission is from?

Might be wrong electronis/solenoids, like I had when I installed repaired tranny

 

[smokn03]

It should be for a 98.Thats what i ordered it for.Any way to verify that?